﻿using System;

/*
 *  Write a program that prints the first 1000 members of the sequence: 2, -3, 4, -5, 6, -7, …
    You might need to learn how to use loops in C# (search in Internet).
 */
class PrintLongSequence
{
    static void Main()
    {
        int number = 2;

        while (number < 1001)
        {
            if (number % 2 == 0)
            {
                Console.WriteLine(number);
            }
            else
            {
                Console.WriteLine("-{0}", number);
            }
            number++;
        }
    }
}
